Add local moonshine model

[art-from-the-machine]

• Added ability to load Moonshine model from local folder
  • This folder is automatically set when Mantella.exe is run by the launcher
  • Otherwise, the folder can be manually set in the Speech-to-Text->Moonshine Folder setting in the UI. If set this way, this setting must point to a moonshine folder which contains two subfolders: model name and model precision (eg /tiny/quantized/files.onnx)
• Updated Moonshine version to take advantage of quantized models